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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88c3f3982619d07b1bb2cee90d16b410c3a32e0c7ce80246c3bdc1eb51296322' 
  AND token = 'Hr40GNTF6pR6tjXMhorF7usTcnZ1uaai20ciuMi+9zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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