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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e394ec53cc7d0fc0e75a408ac40e744678371aa239d022777d988720bdce68d0' 
  AND token = '0Ypkr11Vg/gwpNLdRQtpO0Kn+U9MgP7Di8U6nm7jGCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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