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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8fdcbc9ea413e4204da3bc303e05c30e22017d8a30dd8f4b76ac673e652b0b9' 
  AND token = 'lRxSneFgJ1SOShfawKK+O9iDXUKan9JnAFzz/134/FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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