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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '558bc311a10e8e9df58e2e1c61c2b0e1c10676938b491b722a0eaf3f07390594' 
  AND token = 'WiPUmq7YnRCtzh7ZpMSCyXa6m4r/AkklX/DgWE8l1kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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