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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f6041d477c6190e5a1f1769ee9c76d2e6866251ee33f572d2108caa96e79b55' 
  AND token = 'UzatYOF+1RBBmqb/6Wt6O/LJyubnBk15AldkHQB3egY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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