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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98ed3fcd00ea2419e25e4a2f8b21a34277cef9401eb644a78a61c9323cbf6b1a' 
  AND token = 'mE8ZffdTgIpU5/eSh4uDcAxjeEt46/Xf0Yrdc7jHo3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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