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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efac9f31b20f7f936552735f6ea7778db037d6c535e4850515ddf562b7d0019b' 
  AND token = 'dmSo0E56FPpWNH0vkv3QID8647UzWt1uODc2dc3RbGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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