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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '461d92170272709f83d4a5ff7fa6f67266aa7daef58ff9fa7fbf74d475a271e5' 
  AND token = 'K7nPJ1UYrreY+BqJVNUYxr3LwyhmlII294nIauwxO/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}