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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3b0a19fa8ec7db61922e8e25be692f9eb321351b53abb727b889bb7a0b72adc' 
  AND token = 'DLprct6sQH4uvPEtvUAB3fH89N3UTpcfAw6lU38zf1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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