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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0227e0f16142216f019fb13b5f72e3ddd3c2658daeead0f8e2eb7291c6404388' 
  AND token = 'NRMkNsL456mU8ieDLrVXEt1ZuJrQKg2NGwiM99326uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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