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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b872fd0ea0a53c337715e471e19e72f16370f6a30a3d9ba1b508ed399e58be72' 
  AND token = 'rbbWKQ2ropPBxVoLhR4qJVPL88Fdh8FqNkxd4bmQRd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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