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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '078c6ee99d603c2bb7477be8c577dd2a9bafebfdfee7f6eda044db0ac7ffa010' 
  AND token = 'lWYwt50BnVieDt4bUPalnTqWC6Z1WNmmrkW8vuimCY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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