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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abd83b34589aded26b7b915cf46b8f66d5b1548bf1c7546efb499a12e6dc159a' 
  AND token = 'hzRwe6ylwN85b0CgYMtjlSPyNJmugVUigU5hvWbwcbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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