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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e40ac74e4fa5c3a972d0a175608002c0b8c266adaf4fbdeba0d21316f311dfaa' 
  AND token = 'IqvBNIPENkwDp0FSqS/UeIkdoOk1P+T+C0PtutEOsoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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