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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4ef8ff557f97ff7ab5957181993f7326e3914b7cc8ff721b19ac6fe38d221c0' 
  AND token = 'y4e9HVFQUyFVkzhcVnpXYTHiOfQZ1RQ/8hAW3I1tHXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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