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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b61709cb10ea2591b02a4a4a4954eb9c4dbd00c2e40e638a3a3d23a87da538a1' 
  AND token = '7fJg6zpTp+A4k1l0tXTn/Aj8/ieVBFMEbKk4j5ilqAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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