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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a458fd5fe57af5d08c9ede55d27fa6ef184b31a8d3f9e15fa43d3da772c87f7' 
  AND token = 'f8GJoKExN5Jo4iOvQeuah81l2q+vZLHG5A/znkdp14I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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