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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91437c35e6eb610806bdbd37cffefb4f99c1a87fc07d52ae78ce51f2f41dbec3' 
  AND token = 'ILzYH7sKYcHg9Y07JY5SKqIJIUsbBMbpY9D5ybPwscE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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