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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56dac4273ee974464f3b2abd19cc38956a695c7472ce7031333583a09e4c1ead' 
  AND token = 's0JwrM5ZwkXWmXsGpdiLHXLmW/BGtERmrhGtXWAhB/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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