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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '833db07d7f7d78eb43d943aadee6a5c495997ccfc108879ecebbe03adfd18da3' 
  AND token = 'yUo4S6P9FFqIcxxDZdmXF0Iunv9c3je7PCOoBk4hMMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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