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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '770a30504274db3696b7a822d997ac0764e8bca0aa0b6eb71c707d0207c06867' 
  AND token = 'Uenjb+Vlde3jr4xbnsurDEV/w3Rdzc9hu1PrmTHErBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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