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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c5bc84ddbfcf511ed0123d11cbed496523a848ba0a7dc8f6d1eaaa46277204b' 
  AND token = 'M1onMtICMcQVGQs3LiagvMV/Jtc4GMPORmcey7kxEAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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