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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3d35b10e8e32dfba5227399e499fcfe869c9c3ea04df71651773a0e22120d64' 
  AND token = 'qrKDR16SMK0YTFPcO3+oQfus/eUL1bsg4oGvbeXHHMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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