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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f77fda95c632016b3faf50d5446902878e30a9ea60837917d946cdcc48289968' 
  AND token = 'bZSEUu+kGHY9AxcdYBbBUO+As6ThnSsvxd4I1aH1vbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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