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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a0ddb4d9ad45c7e42cfd3aa2ade903f8b1e2d1f12d976d829854310bed11f39' 
  AND token = 'HMIPBPPdM2FNxgideiQu7Wi0eXpDrGMMWKajTBbKvco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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