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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8396dd3775e9a22552385f33f07e3512ba99da4a40c4b3d7041c95f178243a0d' 
  AND token = 'bhVFUotlkJcm5PQYI39Yn7LXubtQMCEZ8uXDYcbYUBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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