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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a88ba84e01760473a086b31330d59b2e3319e2d33ae2800569d6475454ce0e6' 
  AND token = 'C8h+m58Yu6VYSnJnI6JSOs5M99MVCTz33fTbU5LPE8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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