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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86246ee91e5e32e52e22738c774b0d56d75a213df8bbd20691e6bc63b4a181b9' 
  AND token = '67A5kf7s+XbF4cxu69u5hpwXVewbzRHfN7Xpyf0vLXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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