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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c74fc183e67943f61852a3865463b6445cb395abab1a5e3e3742157ac2815c18' 
  AND token = 'YrFFuP4uIabHDA0xi1It5Sp0LQ+q/CG6VBUNLmoRoMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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