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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dc135c88b9df94e0dbfa122ea39e0711bd7c4099194767a1ee8848e9b3ed9e7' 
  AND token = 'C0I77CLgT/DXnCT9HGZQCZXvTRgSY6o134YReSbQD/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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