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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25319003fa4b7054404f81397ff32df3b7a5b2efcbd31f36cf73f9a7b26da8b5' 
  AND token = 'LwTN8x2gH8aSIcUIqMhBeDTnUToJNwWi5C6jMo3/iX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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