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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87de4ff01f9137548842141e4ac68d499a2ed6a06c1471eff50aa9a2efac7ea9' 
  AND token = 'AkZ2pVylsdXscnsqct+d+hLPN6m9h6jVrOLNC/28HZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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