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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a075291d5abce67247a8ee88dee5de29018f02a79aac79ad1d5a373e5e83ef1f' 
  AND token = 'hQxpEmNKTE5L8otFG8r2sOEbXqd0XmF5Ivq5olezq+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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