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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52ac29fe456cf6a88df6fde0bb03b73a5bb0b6023f192db98067514ee81590ba' 
  AND token = '04NeH+M1vzRYicis6ly9SMBKV9d03MQrsrRsvQvryHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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