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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3c49ffae076005dcffbffb35c346dbe31334c52671912bf65acb500d435a8a3' 
  AND token = 'HgtZSrIcmNFUZx3jEyPogz6I1HplAuSYTh9XcQ6hhe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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