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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f733db3b340106be3f6945d1f252382936114933762a1fdbafdaac90dbd405e2' 
  AND token = 'eS0S5QcKls8JBVeybbsD0x8YvVk4/kwxPTrRfum8THg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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