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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c6cc9bc4fc2a176ff4979cd0babf8d1ec8c8435a558b6ca10f761c93e9219ee' 
  AND token = 'hYg+lCsR8r8x4/mbPxNjDWMsSbHSeUbpEjgZ96kT+ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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