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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a561dfd721d73459a58213dd35139aa065a776fba1495cce5f38b74d1c353047' 
  AND token = 'M8MolXCgWFLF+iJKcq6fOTdm7HUPeIkAEIQ7U0X849k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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