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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3df7dd60a29097ae706f75b129630258dcc63771c9b7febc2cfc252606c260e8' 
  AND token = '9rscHR/o8IjRy0EzfClcOSRr82GG3AS/zOczhexec5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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