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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f57fa55bf175c1506d93d84936c25844a56e097ff3e6606bfe670eba5f87682' 
  AND token = 'P55Y/TLmLq1WW40sP5xvKtra3JkVAIwedRpanQ/wo3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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