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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47c5ff6db8fc5d5f9a9ee25feeeadb4145a8f2a829946ab2654982e54c3bf6c1' 
  AND token = 'SC4qtih2BSEnKEDZnLJEBP4nthDRn9ewkrlApKntVT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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