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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a3f62b1ee00990f0a5afcb6fe702f2d80f911001757dbe375f246eaa5d64e7d' 
  AND token = 'uIe6aggG8azWVBc9FK+/x7pL9lRbe1knpsoHYiTH2GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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