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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7dec4a6cb5ac90843cabe4740c3d0d0ca2c10d6a19042b4083b6cba89abe9153' 
  AND token = 'Y3U/ErEMZDOnPOmlzcV/i4qE/7dBL83eq4enWvQ8SRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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