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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ee0cc85fe04c5a771e2c2f5e551b0647bf3431f5764df080f65a06c5953807d' 
  AND token = '7LShwEGzkTmHbWkYG+QL9fxfhcrNrjXrPf85tuRZUSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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