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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7be4833e7f00d7986b6ccefa0dc492845387a828914dff3e282f8dea06406ffb' 
  AND token = 'Mj54ItEesInTmA2dwAUghaIDRm6eYct+Tu/Fsgai8GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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