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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdf628b16a124bef1be218d17270c842bcbe919560f3c88c97559c9503fca8cf' 
  AND token = 'obXMCovSAujI5hJK8FV3XbnnFl1wn7UCPR8pynCgWDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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