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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '786baa97e4a50e882fbe60c2ea0cee5668f3f37ad452872aeed62aacd30a782c' 
  AND token = 'CJyRLYlfxUm8ZzSLbAUXnVQw2HndJReOAp1QZgIYqMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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