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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f858c1eb6b9cda2760ab369f38ac6b4d6fd5fb9a958fddbfa4c3ac59963632d4' 
  AND token = 'vCjlwSAmMUCHfFICh/3KLlcT0b3vZJVWCOsCfaO3yq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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