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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7de17fadd9c9c54daac5c62e60c30a0dccbec469101bea43815a11711f648cc9' 
  AND token = '+sSNvKPFf+75HSiezhYpslk8PakN9MfSjDl43kOaR1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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