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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb6897496aae6ada1f22d8f3a8b12acd23b45633a853e66049ee73f114ddc863' 
  AND token = 'mUqqFTHUuQmHmu8HNQvdeWDe2LUviSGsBwaIyNPD3d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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