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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa15a6b22c6442a3865d7ddd6cf6307a71f2bd10f69779a33f18ec7c3abb4bb5' 
  AND token = 'qNlrqcN9e3P+LU9BDA1Vbrk4vgtMrwhfG499w4HR1rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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