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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d58b79c14fc8b1ca1b57ef5f9d89c42a749bdbb412d70067ebb17ea49dfa0df' 
  AND token = 'SzMpCis/i7tRrTGcw2uneMSugc/QoffFap0mPNSPGcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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