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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f206ad69863684a38c0b7fb5af6671ed6335788e49303fe53972aa82b71bbb96' 
  AND token = 'xzoy/Aem5+tBodqjjFDCspeRz4G28qXW8NTenE70mk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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