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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3a30131fcf12cebb0f40757f44931814135d38f78f2a45e4a17ce4047398c5f' 
  AND token = '2HoohJzTFFyNEJjFQaC21VRpP60g1vQl3sMf2qnYDG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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