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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0bf4227f28cb94b60245b622ce15a45e1f320d5e45c78437982d2cd6b306e25' 
  AND token = 'NRawzoyyRPfhMK9rgbTDv0cz7aafDPgHhhLaygSTsyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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