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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d6b4ca98b1a4f9e4554dc0353e8f54d61b2c36445bb216a52e44f8f6c95cffd' 
  AND token = 'qBKSOEZXFp1cNoprmubdIypmGiPVC3mM5bWSIf9A5ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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