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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd43c73b5eb1e678c222d50dd012737b26b55e72c69f116276076f5924120dce' 
  AND token = 'rNc++Vygw+boP71Nr1iKmYkufqL0W9j2CRuU/zyopFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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