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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0af8f507c43f8ae0a183d9a65740b67a6dfdd17eefa75f38464e2f8cb0329696' 
  AND token = 'SwUlT0e739qCcb46suzukveYhJ70aahnHcFVQD7v3bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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