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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a85af061332e8f593d74503731f02699c940d18fc0874f772ac67c9fd0f9aca' 
  AND token = 'GbbROBakrBLVNT+vnp88jj/+1SbDsRYos79rXO41rbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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